Simulation of the converted electric field during multipole logging while drilling (LWD)

Zhan, Xin; Chi, Seokho; Toksöz, M. Nafi

doi:10.1190/1.2370296

Cited by 9 publications

(19 citation statements)

References 4 publications

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“…In their simulated full-seismoelectric waveform, there is an obvious signal with the collar wave speed. That result is contrary to Zhan et al (2006) in respect to the existence of the collar wave signal. Is their difference due solely to the formation medium model?…”

Section: Introductioncontrasting

confidence: 83%

“…Special attention has been paid to the electric boundary conditions between the drill collar and the borehole fluid. This is necessary because the drill collar is usually made of steel with a much higher conductivity than that of the borehole fluid, as was assumed but not correctly modeled in Zhan et al (2006).…”

Section: Introductionmentioning

confidence: 98%

“…In their results, no obvious collar waves are seen in the seismoelectric LWD signals recorded in their experiments in the laboratory. It was believed that the elastic wave with the collar wave speed, if there is any, will be too weak to be discerned in the formation because the collar wave radiates only an ignorable part of its energy to the formation through a layer of borehole fluid (Zhan et al, 2006;Zhu et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…As far as we know, Zhan et al (2006) use the one-way conversion approach (Hu and Liu, 2002) to simulate the waveform of seismoelectric LWD with a nonporous elastic medium model. In their study, the collar wave signal did not appear in the full waveforms of the converted electric field.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

Zheng

Guan

et al. 2015

GEOPHYSICS

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Acoustic logging while drilling (LWD) is an important commercial technology for oil and gas exploration. However, the collar wave in the full waveform has been found to interfere with signals from the formation, making it difficult to obtain formation compressional and shear velocities from acoustic LWD signals. We investigated seismoelectric LWD to solve this problem. We focused on the feasibility of obtaining the formation acoustic compressional and shear velocities from electric signals that go with acoustic waves near the borehole due to the electrokinetic effect. The theoretical full waveform of the seismoelectric LWD was simulated by one-way conversion approximation. The full waveform of acoustic pressure was simulated first, with a viscoelastic formation medium. The pore pressure was then estimated by confining pressure. The electric field excited by the elastic wave was seen as quasistatic and was simulated by solving the Poisson equation under the borehole conditions with an inhomogeneous term generated by the acoustic disturbance. In the full waveform of the synthesized electric field, there was a signal traveling with the collar wave speed, as well as signals accompanying compressional, shear, and similar guided wave groups. The converted electric collar wave signal was weaker than its acoustic counterpart, in terms of their amplitudes relative to other wave groups in their respective full waveforms.

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Section: Introductioncontrasting

confidence: 83%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

Zheng

Guan

et al. 2015

GEOPHYSICS

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“…Indeed the tool waves mode present in the LWD acoustic signal are not present in the SE signal excited by the LWD acoustic waves, because the drill string is grounded during the LWD process. Therefore the acoustic modes can be filtered by correlation between the acoustic signal and the SE signal (Zhan et al, 2006a).…”

Section: Crosshole Measurements and Fracture Detectionmentioning

confidence: 99%

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Jouniaux

Zyserman

2016

Solid Earth

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Abstract. The seismo-electromagnetic method (SEM) can be used for non-invasive subsurface exploration. It shows interesting results for detecting fluids such as water, oil, gas, CO 2 , or ice, and also help to better characterise the subsurface in terms of porosity, permeability, and fractures. However, the challenge of this method is the low level of the induced signals. We first describe SEM's theoretical background, and the role of some key parameters. We then detail recent studies on SEM, through theoretical and numerical developments, and through field and laboratory observations, to show that this method can bring advantages compared to classical geophysical methods.

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Full-Waveform Simulation of Multipole Seismoelectric Logging While Drilling in a Fluid-Saturated Porous Formation

Guan

Li³

2013

Poromechanics V

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Simulation of the converted electric field during multipole logging while drilling (LWD)

Cited by 9 publications

References 4 publications

Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

Simulation of the borehole quasistatic electric field excited by the acoustic wave during logging while drilling due to electrokinetic effect

A review on electrokinetically induced seismo-electrics, electro-seismics, and seismo-magnetics for Earth sciences

Full-Waveform Simulation of Multipole Seismoelectric Logging While Drilling in a Fluid-Saturated Porous Formation

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